Machinery for heating and rolling bituminous pavements.



G. P. PRESCOTT & W. E. KERNS. MACHINERY FOR HEATING AND ROLLING BITUMINOUS PAVEMENTS.

APPLICATION FILED APR. 10, 1909.

PateIIt d Aug. 17, 1909.

m J A A M E m m m EN m m W r o M UNITED STATES PATENT OFFICE.

CHARLES F. PRESCOTT AND WILLIAM E. KERNS, or PHILADELPHIA, PENNSYLVANIA, AssIeN- OBS TO THE BARBER ASPHALT PAVING CO A CORPORATION OF WEST VIRGINIA,

MPANY, OF PHILADELPHIA, PENNSYLVANIA,

MACHINERY FOR HEATING AND ROLLING BITUMINOUS PAVEMENTS.

Specification cf Letters Patent.

Patented Aug. 17', 1909.

Application filed April 10, 1969. Serial No. 489,046.

To all whom if may concern:

Be it known that we, CHARLES F. Pensoo'rr and WILLIAM E. KERNS, of Philadelghia, in the county of' Philadelphia and tate of Pennsylvania, have invented cer t'ain new and useful Im rovements in Machinery for Heating and ollin'g Bituminous Pavements, whereof the following is a specification, reference being had to the accompanying' drawings. I Q l Our invention relates" to the employment, in combination with a steam driven roller, of means fo'r deflecting the heated products of combustion, which are normally used for generating steam to'jdrive the roller over a 'itui'ninous pavement, wherebysaid heated 'tproje'cted upon the surface of products are I the pavemen until it is' sufficiently heated t'o facilitate the removal of such pcrtion of the pavement as may re' uire repair.

Our invention is ca ab e of ready adaptation te thes'tandard or'ms of rollers already employed for the purpose of rolling asphalt pavements; Also no gasolene or other form or fuel is used apart from that normally 5m.

ployed to generate steam in the boiler by which the roller is driven. reason of the construction of our apparatus,

' the heated air and products of combustion which are projected upon the surface of the pavement where it is to be removed or repaired are at such a temperature, that, although they soften the bituminous cementing material of the pavement s'ufiiciently to render its removal easy, they do not burn o'r destroy the vitality of the bitumen, as is often done when other forms of heaters are used for this purpose. The result is that whereas-in such previous forms of heaters the entire mass of pavement subjected to the heating flame must be removed, since its utility has been destroyed, by our arrangemerit this is not necessary, and only so much of the pavement need be removed as is actually required for the repairs undertaken,

In accomplishing our invention, we coris'truct upon the forward end of a steam driven bituminous road roller, an auxiliary smoke box and hue connecting with the fi e box which underlies the steam boiler. This auxiliary flue is provided at its extremity with a down-pass, terminating in a hood, which may be adjusted close to the pavement upon which the roller rests. By means of Furthermore by ating the height of the hood above the paveiiiht. In the accompanying drawings, Figure I, is

a-slde elevation of a machine embodying our Invention. Fi. II, is a horizontal section along the line 1,11, ofFi I. Fig. III, isa

detallview of one of the iTues. i The steam roller may be of any standard construction, and comprises a body frame 1, a main roller 2, a rear steering roller 3, a

steam boiler 4, cylinders 5, 5, the connecting 75,

rods of which operate cranks on the shaft 6, provided with a pinion 7, which meshes with a beveled gear 8, upon one side of the main roller. These parts, and the accompanying parts which are shown, are too well known to need further description.

Th" firebox 10, which, with its grate, underlies the steam boiler 4, normally discharges its products of combustion through the chimney which surmounts it, but, ac-

cording to our invention, it is provided with a horizontal smoke box '11, occupying, as near as may be, a central position upon the machine. Since the steam boiler does notoccupy a central position, (being thrown to one side'to' counterbalance the'cyhnders), this smoke box 11, is not symmetrically disposed in relation to the boilerand its fire 0x, as fully appears from Fig. II; Between the fire box and the smoke box 11, are a nuinher of permanent apertures 12. The smoke box is surmounted by a vertic al lip-draft flue 13, from which leads centrally a horizontal flue 14', passing forward beyond the end er the roller; where it is provided with a tee I5, the upper end o f closed, GXCQDL as hereinarter explained, whlle the lower onil -carries a down-draft flue 16', at the lower end of which a s'lidin extension 17, pro ideo at its lower end wit aflaringhoodlS. The 1015 flues maybeIjacketed with asbestos or simi-" lar noh-heat-conducting material, as welt as the fire bex, as shown in Fig. 11.

suitable dampers, the products of combus- 55 is to berepaired. We 60 The hood 18, is fitted with a suitable number of rollers 19, adjustably attached thereto,

so as to permit it to be raised from the pavement at a set distance therefrom, as required. The hood, andthe extension 17, of which it forms a part, are supported by chains 20, which terminate in a ring 21, which is connected to one extremity of a hand lever 22, by a chain 23, by which the hood may be temporarily raised by the engagement of the free end of the said lever 22, with a hook 24, on the flue box 13, to overcome an obstruction or for other purposes.

The transverse flue 14, is provided with a swinging damper 2-5, by which it may be completely shut off. Upon the axis of the dam er is an arm 26, pivoted to a link 27,

whic is likewise pivoted to an arm 28, fixed I upon the axis of the swinging damper 29, set in the smoke stack 30, of the boiler. By this connection the two dampers 25, and 26, are rendered alternate in their action, the open ing of the one necessarily effecting the closing of the other. From the boiler, a steam pipe 30, fittedwith a steam cock 31, leads to a noz- Zle 32, suitably situated within the tee 15.

In operation when it is desired to remove any portion of a bituminous pavement, the machine is placed so that the hood 18, overlies the portion to be repaired. When the hood has been suitably adjusted in relation to the pavement to avoid a waste of the heated products of combustion, the dampers 25, and 29, are thrown so as to open the a former and close the latter, whereupon all of the heated air and heated products of combustion generated in the fire box are forced to pass through the flue 14, to the hood 18, whence they escape from under the edges of the hood. In order to maintain this alteration in the path of the heated products from the grate, steam is injected into the down pass 16, of the flue, and compels the passage of the products of combustion therethrough. As soon as the pavement has been thus suf-' ficiently heated, the position of the dampers may be reversed and the roller moved away sufficiently to permit of the removal of so much of the softened material, as is required for the repair work, it being again noted, that owing to the nature of the heating means employed, and the distance which they are compelled to traverse before they reach the surface of the pavement, the heat applied to the pavement is not sufficient to structurally injure it orbu'rn it, as is commonly the case where the usual oil heaters are employed. In the latter case the whole amount of pavement subjected to the flame must be removed, while with our apparatus this is unnecessary. Not only is there thus a clear saving of material, but there results a much more satisfactory joint between the' old material and the new, since the heated partpf the old material which is left in place, joins canoes readily to the new material which is immedi ately put 1n, rendering the patch quite homogeneous and invisible. As soon as thenew material has been put in, the roller is used in the ordinary way to roll the surface of the pavement. The device is so constructed that the flue 14, and its connections may be readily removed so that the roller may be employed alone when so desired. The brackets 35, which support the forward end of the said pipe 14, are secured to the frame of the machine by means of bolts 36. After removing the said bolts 36, the pipe 14, may be turned so as to release its threaded end from engagement with the flange 37, on the vertical flue 13. The opening in the flange 37,

may thereafter be closed by the pipe plug 38, as clearly shown in Fig. III, which is a face view of the flue 13.

The importance of providing for the ready removal from the machine of the hoods and parts which relate to the repair work, will be apparent when it is considered that a roller such as is employed in connection with our invention is commonlyused in. the construction of new roadbeds in which no heating of the surface is called for, and in which the presence'of the hood andauxiliary parts, as shown in the drawings, would operate detrimentally, especially when cross rolling (i. e. from curb to curb), is being done. Un der suchv circumstances, therefore, the attachments to which our invention relates, are entirely removed from the roller, and are only attached to it, and employed, when the roller is employed specially for repair work.

Having thus described our invention, we claim:-

1. The combination of a steam roller, including a boiler and fire box, with an auxiliary flue leading to the surface of the pavement upon which the roller stands, in combinati'on with means whereby the products of combustion from the fire box may be caused to pass either through the boiler or through the auxiliary flue to the surface of the pavement.

2. In a combined steam roller and surface heater, the combination of a boiler and its fire box; an auxiliary flue whereby the prodnets of combustion may be led from the grate to proximity with the surface of the pavement upon which the roller stands; and an adjustable hood upon the extremity of the auxiliary flue.

3. In a combined surface heater and steam roller, a steam boiler and its fire box, surmounted by its smoke stack an auxiliary flue also communicating wlth the fire box action of the dampers, whereby the opening of one effects the closing of the other.

4. The combination of a steam roller including a boiler and fire box With an aux.- iliary flue leading to the surface of the pavement upon Whichthe roller stands, in com bination with means whereby the products of combustion from the fire .box may be caused to pass eitherthrough the boiler or through the auxiliary flue to the surface of the pavement; including a steam pipe and injector whereby steam from the boiler may be injected into the auxiliary flue for the purpose of maintaining the down-draft therein.

5; The combination With at steam roller including a boiler and fire box with an auxiliary flue leading to the surface of the pavement upon which the roller stands and termihating 'in an expanded hood zemeens whereby the products of combustion from the fire box may be caused to pass either through the boiler or through the auxiliary flue to the surface of thepavement; and means whereby' the auxiliary fine with its hood may be temporarily disconnected from the steam roller.

In testimony Whereof,-.we have hereunto signed our names, at Philadelphia, Pennsyl- Venia, this eighth day of April, 1909.

CHARLES F. PRESCOTT. WILLIAM iErKERNfi Witnesses:

JAMES H. BELL, E. L. FULLERTON. 

